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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeb3b4c37d272118a6e77cc95ce58fdbbc03e8161db523f6bd7c94c510e3e4e' 
  AND token = 'OxOvfqKSLdaj02Vj2QgH1B5289dRmPLU7ZAGxgQmBUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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