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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32db9c0c8b33e4a76d5cf8661b75edfa75f152615db08624e33c400f90979a28' 
  AND token = 'WWRuWUwL4jf81Efx3RSsDrkhws+tghE+ycSml85C3vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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