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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb49b53fd2c7f11839f480627b09691ddde09d17583a91fae07d0284de7d4e3' 
  AND token = 'RkS6Q0Q2CmMRrpNM0Cb9QcHNpVrZ8ToizZIfCGIXR7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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