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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd586a034bc3a9c0d696e5d6d4a63f0c5dc637f7993347ec7e3f0107a86dda65e' 
  AND token = '7HKI5LkkLdYjz1TgKWsmgQ8NBkVimeyK2sTQKYNom5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}