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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f20828fc008f68382ad612ae2b95054444e8b124d56a945ae62c66f6c341b9' 
  AND token = '45nZDkrcl5+aBBU2wXUuzOH2yHsYuB43zzIXbW3l7eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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