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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054004e7153f33578623998d293b8279a7421e6ddf68624fe8ab441637473507' 
  AND token = 'UbYOoY5MMmNx1/StlhGj8E0x+U3/ySh+u96CKAf1PQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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