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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e3a17575927aeac9aa6a7349cf1c239354d2d4659ac9a44005b5375208d68c' 
  AND token = 'kqMfo/nZyu3IzA8CXeiQJ66nU9fHhtGdvdCLjLYwCuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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