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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c2d59e745269f8153e3161beacef403dfb065405b841d6fa9ea920e77c182f' 
  AND token = 'g4f7fMCR+4oW26EE+6b50m68iFuNbvqjYeNiUOq5GCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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