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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22d647901bd3074f6359e7d8c8db442eab074ac71cdef10c6f86fec20ebba155' 
  AND token = '69i9K+/HtXQfKcVb/n7F7rjXnexSgzXDzuR8vx4Lcnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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