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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6de6b953134ee6107b100abd3a1bfa2bf95833dfc879605f7cb35fdd329606e' 
  AND token = '1cOHBA3KZtqL3NlkXAZAD/KdEzrcLcE+o52Kb/ypLIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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