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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52cc3a5821a7a5ff180ad58e05cee9c11f64df74583f7354db8b4224e7d7db5' 
  AND token = 'gwxcl02Oss3w2JS62ns1APGrWlHCtdNzI4lfu4AFSUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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