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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94f6145c49703e0db13b4dd2ab158dd0e5bf8c4dfd2b690f3c1f02c11a33640' 
  AND token = 'cjXvgRcyACMARSnDhwxfu0lQrJWPqal3X1A/7LDyYmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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