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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39bab12ac0f7aee6f6606363eb68093a16b478e729007bc556384496e232795b' 
  AND token = 'ccEx0jYjmqHH9DfKeMbdVZDT6GPDbrLZ3p2p7BnsG3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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