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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '382d0cde162f982ab2895616df5baaee3d4a2f732daf715f871dc7c5d1578e48' 
  AND token = 't+PlJaWO63lZ0tYviPT5z8OAefAdS/qwo/gf33Udz4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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