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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359876a776d4c616148b6e6849414c6bd2dbfccbdda21db458e8422cd053f4f8' 
  AND token = 'hiVYR0iwz1jLfMHLM/J5yEsbyJiD26ot/vC7G2HDP/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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