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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee891d09a53f81c69a9854d3a1534beed5296b3f017ec3842acb097c9ff8682f' 
  AND token = 'h9943QujTYeMb9CJkVtqvHzndurDr7fNPc1g5IXUU1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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