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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0d0f84e0e09b8ec9f7a5ad7d95cd6f7d95c542305daa4b9435eac204920eac' 
  AND token = 'EdSp2Y5Sfoi6LrZ8h1E/jVkAZvkoYkYRTztVsvtxwuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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