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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59ef6df414705300e673833b5853d871c665ec8af0a03c2cd0cfb18b61fa761' 
  AND token = 'j1N2U++t9PSckyw5Ok2Oh2GO7pnX7FlGzUB2Q7Oqmhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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