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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f87e3e2cfe4e780201799f5f1bcfb991ad33866aab80dd41297e4eae26b0595' 
  AND token = 'Db90PovqJvXdP4xYk8eyHhKJU1QK4HnW0zRtBh/WUAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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