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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2132308e94572012986012d6564a7d734bc5095eff861298fca8f60e6270018' 
  AND token = '/CzQaz37CrcCA1YUziDUYk68RKD2PY6+aZMKflo2A6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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