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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1658d9f4cc48fbbce5c6d8e8de9ebb28fb6334ee68395c0b95f4418e28c8f036' 
  AND token = '4qb0lr8f3sIjg4tY3YzFnmxSr+8hGeEWby8HyloKCfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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