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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c07ce7bd1a0dd5e92261a712f7fc8acae705ffe50a2fe07a1598d5c9cdb580' 
  AND token = 'E8qM5DAIn2AdSCE7hoXf2IdeX6s1zZ2iiQEBWFXuL7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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