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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4839e633920d62513d5ea53543f695b3c824d20c17b9c46a38f123dd0ba972e8' 
  AND token = 'FL3qZSQCyiDFLEKsCIvzMHLu6rzQ6C2VEgOsdXOOFdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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