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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1eb9d4d5e1ba98c621871bf0322efcaa20831369d749aeb145f47bdb0e0f37' 
  AND token = 'K/JkJJTcHdyQ6vBxdw0F6LHQVbDU5WzgR4NuNacjY1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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