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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfdae64432afe1068156de7682f922bfb6e99e58fe70a1699201448ae2b1ce9' 
  AND token = 'Eq5c86AvfqNtytE/Pf7BJJdppNwQEsUxHVZXVmi0tsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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