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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33b06f0a9a618258cdae0781fa0458bb135118c5ff1850b3adc5b4b7c557a8d' 
  AND token = 'cccFu9kIYM9DEXHiiXjX7R3rURO3gQn3DXXTOvbiT0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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