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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f66be74cb7e0c99e7d15a300b10ce011a1011cce97c49127acf3d4f894607be' 
  AND token = 'wRYR+F9u3/d7GtWxNYb9q0dzS8F+8yV5zCAE2uKZQPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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