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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4e518a46fcdaf7a1c15666f7c61eb7e6e56f515731d168136a78ed8c89c665' 
  AND token = 'AiLiOUSOa9rmMVsQFwZjMiCqF7Sy2hMerkxxT62BDtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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