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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2c383b06f2bff3f66ba35bc350bc9b9ff199d7b03f669dce4e57812953bc80' 
  AND token = 'mKdZ7HKY49V5h4Znn93GkJecl9NQM3DBrKlmCw9b70I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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