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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f92dda3035385f19a7815de969a25e9fc993ebab4ce22f3c8396ccfa08baae0' 
  AND token = '2eouFFihT0N9rVs3mCd4Her9QVmVAqHlV0mdMhHvrX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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