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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31cf0522c10bc286214dd73bd9757b11676c5ae17544b83d2db91f241d3be44' 
  AND token = 'eJGyLC/ltn0dL2FvgZ7B9u/1sXiCTWXIImvWRlBe5Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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