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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91c1917295d2211aacbcbdd6b0bfe76dfc9b552ebfe31f497edc4dafb856bc9' 
  AND token = 'XJPqF2bpgRV05j98gxo4soqkZy7FOS5RuLKtbo+53jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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