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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc345bb3339244bf27f8dd3b2113b4706923e2e5d50b0840ca1496bc49b3be32' 
  AND token = 'QWwqoi+MFi9lMwGnw4bV/2Hvk2LibuGNYFJNtSbIFek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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