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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0163fba65fcc274073579f4de5b3e23ad8f6d11f4daca171a524f27f5fbe24' 
  AND token = 'RDGfS4K4FhKEO53wuk8ydY5qydJwW1PeCpZfjiGfdTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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