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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e10e5fdbad2f47d108789d4ae014ee028c6be08a2220614acb2ce4d39594a5e' 
  AND token = 'lavQ3xUrBiM5vuWR2gsAau1t+vDUH3ebBVqtUGxRMAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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