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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a75f557ba7dfc7a0d9a19391059d18a120426c837d7e25a0ddf817a1e214c9' 
  AND token = 'eqLJkGOguh71TEufeMTcsLH3/4p1XzR87BEltb9SnIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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