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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9784c7111a3ebe79cbe39da176940cecaba3f990c6914e1d132e11f41cd4f4a' 
  AND token = '8eV/dSjBxcGrx0ax7f0DtfU//6Bv8WOsrnEDuLQvWIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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