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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97393e87ecf7a94e7138d67b1d05dc1b7191ff9bb28c86b78493ab6ee2a4a8b' 
  AND token = 'LuhkAjDnrb8kHbg7owG93y82LxpsQJdDpta5O04OjYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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