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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6aa92a9442619adb19155724e9f8f4064e7a5e8c43d2e908504d03d8a873f8a' 
  AND token = 'sHSpokYu7iS5kCrWT5RLDxwUSTwbCuKzAkqHx1naVHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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