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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112dcead31d5ded5d5be319fa50f9ee3d87ff13d2413367f69b806531f0867da' 
  AND token = 'WM6z3Psq6GXZLdj3cj16OJcG3H22Xk9Re+t4HugAtWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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