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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e5227152d800fbbf031241ca8906b4037bd00a06f2bdf7ba5b1b8df044d2e6' 
  AND token = '2e0cbILNnt3ta58umoqfrIaKbRcPcSctsKvGXHGkrh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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