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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eabda19a98fbe988b90f5e17c5097d9cdb53b06ee656f934c7eb4ece6fecc8f' 
  AND token = 'TtXzjoouxBiX0YKTyRXixO5MkjV1SDOtLxoeln6F4JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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