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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4374ff389b5aa4e367f0c6a5bfa248f71b6ff9d0b19e99393456ab3354aec16' 
  AND token = 'M54DbiLibbEWx2j9suJs/PjET9CPXSl03YblMeFI97Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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