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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a696d823edb96d48f9d2e211c81783d8ab95c3e0e0d3e9bb725c21a567a6e18a' 
  AND token = '0dxI7kS6x/LykwGV/12U5dOqJWjgsktdunF0LFaovdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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