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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3528551652244daa641bc4ccc3d382800d485b17c6301c6a946d38a7a69fbc' 
  AND token = 'sARYgsryyz13z+GUzKpNSxUvTeCAxa/wofkJJJT0xdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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