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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c576cadac0b5474d82b54168d6776f55f7df1e0dfacb54d563eb3236cab00235' 
  AND token = 'ppVpCOFqxYuM2QPbfXM2CjwF53ho764DOBH2/bwZWMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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