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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85a6306b454abe3f0ccdcf829e52eb3d702ac93c5513ada018086341d660311' 
  AND token = 'gu31s5CvMCt/H1INB4qf83Q9OjrQWOsns1DuULPLHoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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