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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd246c5eb7cb6b470cbcac00a16043600203ba49aace252d80c8b3e0157f7d0f' 
  AND token = 'vv2eqT0scuNSTaQbcZ4TI7dNF987mJwnn7dVbXeu/VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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