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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8942a75174a2ab65fbc3a92a64289475ee6fcca33492da9cb3c94342ccba3363' 
  AND token = 'TYa8P3gQbJJJDytqWPFwI0+ogeQ5Pl3jENGy0OyVoVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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