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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e874b32fbd4e3d56d5af293f452cd38f1d2199732b283dd565cdddcd6e2d607' 
  AND token = '9oveZ1FTTBTINOoW2OII1z8oR+6JL9i+6myNc4JxRsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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