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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951359b8c5ec00838c4afa846cdfda681874c71b048636dbd6630e8f9e783b8b' 
  AND token = 'gZ1/C80gxOKQummCAfJIz1PFqij4RHdr5G0D44VXWWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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