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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1dc765f0dc627c3524d53866b6ed68c4e4b057267468c91932a467c9639caae' 
  AND token = '+rJO0QqhTQxHUX50QH/Tvmc1PgACCwjsZNxepFcH4m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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