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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba3bde7a6ad0cfdb175fc42f7b06e3a553fc471d2bd12703e8ec24202da4a3a' 
  AND token = '95njeuWaoHjP/JLIzRG0Byi37QzQXPAA7NC7bAMrMfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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