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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b8c78d101a7bac4d6b27335c8724423cb3b6919d48c7781bfd7591182f1897' 
  AND token = 'Dbeoglat1bHWlwiqmAg7hItm2peFoNT5M1hz28lEWC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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