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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26c336d32f939f44f94c5a5e30eb6ea273dd588b6ca37472a15c7de22b783f1' 
  AND token = 'Rd7f5ID4SKRjJHtalO78YAxkPh2VMYROgknyrL93b/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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