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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86f15dc3d036b825ca7e4e8ce9388f440e251a0abbe6dff19566409b4d5dc59' 
  AND token = 'LHke2aqW8c2XVTkavVBe0IRJur73VqaArLYqjv4xJ54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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