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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ee096b04f298c6c2ce95ab473b0dfbd015ae305d944c4b04961fda105418ab' 
  AND token = 'POKrYApSHdQ03xzKnkfZsBKaFt2X1yw8Sn/6H5VmByo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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