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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd9e7ea9d467c942ceb6b4139d6c35b169b6d46d8cf535eaa6ac6e58a1deac9' 
  AND token = 'rKzGdVqxC1D05FNkxLN27c33Z8PfP2CN8A1N39dtOpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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