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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec4aa917619da90fc630899fb1782e7ac8c578b0e881335db98694eed0373ed' 
  AND token = 'H4Eqa7Urh6JwjSK5XOK+LPpH5Tnrq4m0roy40aJbB9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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