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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d064a67cfb2521209955efb334856695ca5699ec077dcda7decd017adf5f876' 
  AND token = 'ENBju1K6d+o3eA1EDFDuNoOCXnV9z1Jehf9F7E3FbxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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