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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02f4c638f81ef615ec9c0cffb86d966ca51319d2d87408669939f098508043ef' 
  AND token = 'VdwgdosBQ0tbzWgUUZosQGijrc9DthCaP2cqIdr2Mc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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