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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694076c028beda7f40c80b839af0cd45162952161224031c5359889dbc59b516' 
  AND token = '7FaN8ExzsJoB5Erq2kNBLHXE8uDWxjPVz4EXlPbeGMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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