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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccb1558b63a73e855a11ccd0999a4d72c4039ee9b7b4a3d2416bb799b1b8d9c' 
  AND token = 'M11I5AdvVfSZgzyl+c+6jWgwSJGUWARHkrJVgOMWAQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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